Remedies For Alarms - Mitsubishi Electric MELSERVO-J3 Series Manual

11. TROUBLESHOOTING

11.4.2 Remedies for alarms

CAUTION
When an alarm occurs, the trouble (ALM) switches off and the dynamic brake is operated to stop the servo
motor. At this time, the display indicates the alarm No.
The servo motor comes to a stop. Remove the cause of the alarm in accordance with this section. Use the MR
Configurator to refer to a factor of alarm occurrence.
Display Name
A10 Undervoltage
A12 Memory error 1
(RAM)
A13 Clock error
When any alarm has occurred, eliminate its cause, ensure safety, then reset the
alarm, and restart operation. Otherwise, injury may occur.
If an absolute position erase (A25) occurred, always make home position setting
again. Not doing so may cause unexpected operation.
As soon as an alarm occurs, turn off Servo-on (RYn0) and power off.
POINT
When any of the following alarms has occurred, do not deactivate the alarm
and resume operation repeatedly. To do so will cause the servo amplifier/servo
motor to fail. Remove the cause of occurrence, and leave a cooling time of
more than 30 minutes before resuming operation.
Regenerative error (A30)
Overload 1 (A50)
Overload 2 (A51)
For the alarm deactivation method, refer to section 11.4.1.
Definition
Power supply 1. Power supply voltage is low.
voltage dropped.
2. There was an instantaneous control
MR-J3- T:
power failure of 60ms or longer.
160VAC or less
3. Shortage of power supply capacity
MR-J3- T1:
caused the power supply voltage to
83VAC or less
drop at start, etc.
MR-J3- T4:
4. The bus voltage dropped to the
280VAC or less
following value or less.
MR-J3- T: 200VDC
MR-J3- T1: 158VDC
MR-J3- T4: 380VDC
5. Faulty parts in the servo amplifier.
Alarm (A10) occurs if power is
switched on after disconnection
of all cables but the control
circuit power supply cables.
RAM, memory fault Faulty parts in the servo amplifier.
Alarm (any of A12 and A13)
Printed board fault
occurs if power is switched on
after disconnection of all cables
but the control circuit power
supply cables.
Cause
Checking method
Checking method
11 - 4
Action
Check the power supply.
Change the servo amplifier.
Change the servo amplifier.